For everyone when the cfield pot is at 0.0 its 2.5ma and at 9.9 its 6.38ma.
The jump is over 4 major divisions of the cfield pot and I still did not
match the reference..
So looking at the synth chart on page 3-9 started to see how far it had
gone.
Tube says the switch should be 8714 or -240 E-10 t
Andy
What a find and what luck you did it right from the start.
If you had not allowed it to pump down the way you did it may have mislead
you into thinking there was a big problem with the rest of the circuits not
turning on or pulsing on and off. All expected and normal in a gassy tube.
Its funny
Hi
Ok, if that still turns out to be correct … that’s just about 2 ppb. (
1.6667…).
To do that with the C field, you would need to make a *major* change. It’s
essentially the whole range of the pot. You already know that it’s off in the
direction of needing more counts on the dial. I *think* th
Yes absolutely it can go back and it is the same offset. I can get real
numbers from memory 3 seconds for 5ns drift and the units slow. Will
confirm and reshare.
Regards
Paul.
On Wed, Dec 2, 2020 at 2:52 PM Bob kb8tq wrote:
> Hi
>
> Just double checking….. Are we still after a change went past
Corby that explains what I have been seeing and wondering about over the
years I have had Cesiums. Get it all pumped down and then the next time I
get those bursts. I am letting a recent 5061 pump down. It seems to get
really dirty each time I start it but gets down to 16 on the meter after
some 48
Hi
Just double checking….. Are we still after a change went past 1/3 of the pot
range?
Can we get the pot back to the original location and measure the frequency
offset
(even if only in a crude fashion)?
Best guess is still that this should be a ppb or more of shift. If it’s down in
the
4x1
The gettering in the tube is only for capturing any stray Cesium atoms
that don't get caught in the main gettering patch. If the gettering fails
or gets too loaded up then the Cesium background level will get too high
causing poor SN.
The ion pump is for any gases.
When a tube is off for extended
Corby will check. Though in looking at the cfield circuits it does appear
all to be correct. Its some other odd offset that has crept in.
Thanks
On Wed, Dec 2, 2020 at 1:56 PM wrote:
> Paul,
>
> One other thing to check.
>
> Put a DC coupled scope on the C-field pot wiper and rotate the pot back
Paul,
One other thing to check.
Put a DC coupled scope on the C-field pot wiper and rotate the pot back
and forth.
Make sure there are no jumps or noise.
Sometimes the pot gets noisy in a section.
Rotating it back and forth across the bad sections will usually clean it
up.
Cheers,
Corby
__
On 12/2/20 10:17 AM, djl wrote:
or:
https://ntrs.nasa.gov/citations/19870019361
from Charlie Greenhall
A nicer looking version is available at
https://ipnpr.jpl.nasa.gov/
click the 1980-189 button
use your browser's search function for Greenhall..
https://ipnpr.jpl.nasa.gov/progress_report/
or:
https://ntrs.nasa.gov/citations/19870019361
from Charlie Greenhall
On 2020-12-01 15:52, Tom Van Baak wrote:
Hi Skip,
You are exactly right. And, surprisingly, this is correct and normal
for most TI counters.
The short answer is -- for your use case, a *zero deadtime* time
interval counter
When I found my HP5061A lingering in a skip, soaked in rainwater some 20
plus years ago, I thought I'd be lucky if it was only good for the OCXO,
and never even contemplated it might be fully working. I first left it in
a warm room for a week to dry out then, without having a clue about how to
get
Hi
Ok, if the synth is off the “suspect” list …. *and* it’s a good solid lock.
Back to the C field.
If it jumped 4x10^-11, that’s a very different thing than jumping 2x10^-9.
Finding
the “source” of a 0.04 ppb shift is going to be a lot harder than finding a 2
ppb
gotcha. Best to nail down th
Hello to the group.
Last night I dug further into the 5065 along with a lot of reading.
The synth is producing the correct frequency according to the charts here
and in the manual.
I also now see that any logic I may have assumed about the
thumbwheel switches is completely wrong.
The test tonight w
Morris
I do see that of the 3 HP5061s the results are different and do know each
tube leaks or internally emits stuff. But as you say maybe the metering is
off. It definitely trips out at 40ua.
I have my units that pulse like that and then settle down as the tube
clears.
But its hard to explain tha
I think there's quite a bit of variation in leakage rates between individual
physics packages, and there's also variation in the accuracy of the
metering. I recently started up my spare 5061A after over a year in storage.
The Ion current meter showed zero with the Cs off but about 40 in the Open
Lo
RTGs, much like solar cells, have a terminal voltage that drops pretty much
linearly with the current you draw from them, and a "maximum power point"
where V*I reaches a maximum (see for example page 37 and several later pages
from https://apps.dtic.mil/dtic/tr/fulltext/u2/a057483.pdf ). As they
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